Siemens EH.85M.21E Manual de usuario descargar pdf (Pagina 6)

ST800 Guidance Notes

Page 6 667/HB/27000/100 Issue 1

On power-up, the self test facility...

Checks the integrity of the main processor board

RAM FAULT

PRG PROM FAULT

XTL FAULT

DPR R/W FAULT

All the above faults point to problems internally on the main processor card.

Checks communications with the secondary / phase bus processor

P/Bus CPU....

If the processor cannot be detected, then the self test will wait indefinitely at

this point with the red system error LED flashing. Check that the processor

and its firmware are fitted.

Examines the lamp switch cards to see how many are fitted

No L/S Cards Found

No cards were detected, check the ribbon cable.

Bad L/S Cards Found

e.g. if the first and third cards are detected, but not the second.

Waits for ZXO synchronization and checks the mains frequency

ZXO Sync’d...

If the phase bus processor cannot synchronize to the mains zero cross-over

signal, e.g. because the ZXO wires are not connected to the back of the first

lamp switch card, then self test will wait indefinitely at this point with the red

system error LED flashing.

Mains Freq Error

If the mains frequency is more than 5% out from either 50Hz or 60Hz.

Checks all the ADC test voltages on all of the lamp switch cards

ADC Tests....Failed

ADC Test Readings

0.0V 2.5V 5.0V

B0+ nnnn nnnn nnnn

B0- nnnn nnnn nnnn

... .... .... ....

If the test fails, then the readings from each board, taken at both the positive

and negative mains peaks for each of the three test voltages (0V, 2.5V and

5V) are displayed on the handset.

Ideally the values should be 0, 512 and 1024, so try replacing any cards with

readings which are very different. If all the readings appear too high or too

low, particularly the 2.5V readings, then this may point to a problem with the

5v logic supply.

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Siemens EH.85M.21E Manual de usuario Pagina 6